My vintage Windsor chairs have nailed-in metal glides that make worrisome screeching noises when pulled across the hardwood floors. Since I was unable to remove the metal glides, I tried covering them with peel and stick glides. Though an improvement, they still scraped the floors. I decided to give these a try and they are wonderful. They are little black rubber cups with a stretchy top that fits over the chair leg and the gray part is the plastic glide that sits on the floor.
My chairs have tapered legs with a 7/8 in diameter at the bottom. As others have said, it takes a little work to install these glides, but by the second chair, I learned the technique. Once installed, mine needed a bit of finessing because the bottom of the chair leg is not flat or level. Now my chairs slide across the floor as smooth as silk. They seem very secure, but If they don't stay on over time, I intend to use some kind of goopy adhesive inside the cup because I can't imagine that I will be able to find anything better.
My chairs are black so these are very unobtrusive. The package shows a photo of the same glide in a lighter color.
MAGIC SLIDERS L P 4225 4 Pack 7/8 "-1" RND Slider